Baptiste Massemin
Freelance Backend & Platform Engineer | Ex-Shopify
Salaire / Taux journalier
Aix-en-Provence, France
Freelance
À distance uniquement
Expertises
Langues
À propos
Introduction
Experienced developer in startups and scale-ups, with deep expertise in scalability, resilience and complex systems (up to 500k req/s at Shopify). Also a seasoned DevOps engineer, with several cloud and Kubernetes migrations delivered end to end (Heroku to ECS Fargate, ECS to EKS, VPS to Kubernetes). 15+ years of experience, autonomous from design to production.
Expérience de travail
Infrastructure Engineer
PancakeFreelance
avr. 2026 - Présent
7 mois
À distance
• Built a GKE infrastructure for an OpenClaw-as-a-service offering. • Developed a Kubernetes controller managing the tenant lifecycle. • Preview environments deployed via ArgoCD on labeled PRs. • Managed the entire infrastructure as code with Terraform.
Infrastructure Engineer
Ctrl+GFreelance
mai 2026 - mai 2026
1 mois
À distance
• Built a large-scale distributed LLM task execution tool in the cybersecurity and research space, consuming 14 billion tokens in 24 hours.
Infrastructure Engineer
ContrastFreelance
mai 2026 - mai 2026
1 mois
À distance
• End-to-end migration of the platform from Heroku to AWS ECS Fargate, delivered in full autonomy. • Seamless cutover for developers and users alike: workflows preserved, no service interruption.
Infrastructure Engineer
BasaltFreelance
déc. 2025 - avr. 2026
5 mois
À distance
• Designed and built (Go, TypeScript) a high-throughput observability pipeline for logs and traces: OpenTelemetry to Kafka to Quickwit / ClickHouse. • Built an EKS infrastructure for an LLM observability SaaS application. • Migrated workloads from ECS to EKS and consolidated the architecture, cutting infrastructure costs. • Built a production-ready Helm chart for on-premise client deployments.
Shopify
sept. 2019 - janv. 2026
6 ans 5 mois
Aix-en-Provence, France
Senior Backend Developer
avr. 2022 - janv. 2026
3 ans 10 mois
Aix-en-Provence, France
• Built and operated critical Go and Ruby backend services across distributed Kubernetes clusters, sustaining up to 500k requests/second with zero downtime tolerance. • Owned projects end to end: design, implementation, production rollout and operation on the infrastructure. • Met a very high quality bar driven by the zero-downtime requirement: progressive, battle-tested rollouts, thorough code reviews and demanding documentation practices (systematic design docs). • Built and maintained the internal Kafka client libraries used by every engineering team at Shopify (Streaming Frontend team). • Led company-wide Kafka standardization in sync with every engineering team: unified producer/consumer implementations with built-in tracing and metrics. • Ran multi-region operations and infrastructure changes (Terraform, GKE) with no service interruption.
Senior Backend Developer
sept. 2019 - mai 2022
2 ans 9 mois
Région de Montréal, Canada
Platform Engineer
ChessmoodFreelance
janv. 2025 - déc. 2025
1 an
À distance
• Refactored legacy web applications into a microservices architecture. • Migrated the platform to Kubernetes (EKS) with automated GitOps delivery (GitHub Actions, ArgoCD). • Set up full observability (Prometheus, Grafana, VictoriaLogs) on a platform that previously had none.
Platform Engineer
SKEZIFreelance
janv. 2023 - déc. 2025
3 ans
À distance
• Technical lead on the platform's architecture decisions. • Migrated VPS hosting to Kubernetes on sovereign French infrastructure (OVH), compliant with health-data hosting (HDS) requirements. • Set up the CI/CD pipelines (GitLab CI), monitoring and security management. • Contributed to ISO 27001 certification through process documentation and technical audits.
Senior Backend Developer
Ubisoft Montréal
avr. 2017 - sept. 2019
2 ans 6 mois
Région de Montréal, Canada
• Technical lead for the rewards, challenges and battle-pass systems of major franchises (Assassin's Creed, Far Cry): heavy domain complexity, consumed across multiple games and teams. • Designed and built event-driven ASP.NET Core microservices (RabbitMQ, DynamoDB) sustaining 40k requests/second with high-availability requirements, including game-launch traffic spikes. • Optimized hot paths and instrumented the services (metrics, alerting) to hold up under launch-day load.
Developer
Penaranda Informatique SAS
oct. 2011 - avr. 2017
5 ans 7 mois
Built and maintained C# medical radiology software across the full cycle: requirements gathering, development, on-site deployment and user training. Integrated with hospital systems (HL7, HPRIM).
Developer
SOFTWAY MEDICAL
janv. 2008 - oct. 2011
3 ans 10 mois
Backend development in Java for a radiology information system. Part of the interoperability team, handling DICOM, HL7 and HPRIM data flows between clinical systems.